Flat glass prices remained stagnant in November after increasing 0.3 percent in October, according to the latest Producer Price Index (PPI) report issued by the U.S. Labor Department.

According to the report, flat glass prices are up 6.1 percent from November of last year.

The PPI program measures the average change over time in the selling prices received by domestic producers for their output, according to the U.S. Bureau of Labor Statistics (BLS). The prices included in the PPI are from the first commercial transaction for many products and some services.

The flat glass index sits at 127.8.

In another report, import prices for glass and glassware remained still in November after inching up slightly by 0.1 percent the month before. Prices in that category are up 0.5 percent from November 2014, with an index of 130.0.

Export prices for glass and glassware also stayed the same in November, marking the third time in four months they haven’t changed on a month-to-month basis. Those prices are up 0.3 percent from this time last year and have an index of 98.8.

Prices of construction materials saw a 0.3-percent increase for the month, following a 0.2-percent increase in October. Prices in that category are down 0.7 percent from November 2014. Final demand for construction dipped 0.3 percent in November after edging down 0.1-percent the month before, but those prices are up 2.1 percent over the year.

On the whole, the PPI for final demand increased 0.3 percent in November, seasonally adjusted, after decreasing 0.4 percent in October. On an unadjusted basis, the index for final demand decreased 1.1 percent for the 12 months ended in November—the 10th straight year-over-year decline.

Overall prices for U.S. imports fell 0.4 percent in November after a 0.3-percent decrease in October. Export prices dropped 0.6 percent in November after declining 0.2 percent in October.